* [dwmw2:gpc-stealtime 1/1] arch/x86/kvm/x86.c:5242:2: error: call to undeclared function 'kvm_gpc_mark_dirty'; ISO C99 and later do not support implicit function declarations
@ 2026-02-04 8:03 kernel test robot
0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2026-02-04 8:03 UTC (permalink / raw)
To: Carsten Stollmaier
Cc: llvm, oe-kbuild-all, David Woodhouse, Lilit Janpoladyan,
Sebastian Biemueller
tree: git://git.infradead.org/users/dwmw2/linux gpc-stealtime
head: 34c3f2e56cbf5d6b03946d531e66a91566d90db6
commit: 34c3f2e56cbf5d6b03946d531e66a91566d90db6 [1/1] KVM: x86: Use gfn_to_pfn_cache for record_steal_time
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20260204/202602040904.0eXBWOvu-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260204/202602040904.0eXBWOvu-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202602040904.0eXBWOvu-lkp@intel.com/
All errors (new ones prefixed by >>):
>> arch/x86/kvm/x86.c:5242:2: error: call to undeclared function 'kvm_gpc_mark_dirty'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
5242 | kvm_gpc_mark_dirty(gpc);
| ^
1 error generated.
vim +/kvm_gpc_mark_dirty +5242 arch/x86/kvm/x86.c
5201
5202 static void kvm_steal_time_set_preempted(struct kvm_vcpu *vcpu)
5203 {
5204 struct gfn_to_pfn_cache *gpc = &vcpu->arch.st.cache;
5205 struct kvm_steal_time *st;
5206 static const u8 preempted = KVM_VCPU_PREEMPTED;
5207 unsigned long flags;
5208
5209 /*
5210 * The vCPU can be marked preempted if and only if the VM-Exit was on
5211 * an instruction boundary and will not trigger guest emulation of any
5212 * kind (see vcpu_run). Vendor specific code controls (conservatively)
5213 * when this is true, for example allowing the vCPU to be marked
5214 * preempted if and only if the VM-Exit was due to a host interrupt.
5215 */
5216 if (!vcpu->arch.at_instruction_boundary) {
5217 vcpu->stat.preemption_other++;
5218 return;
5219 }
5220
5221 vcpu->stat.preemption_reported++;
5222 if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
5223 return;
5224
5225 if (vcpu->arch.st.preempted)
5226 return;
5227
5228 /* This happens on process exit */
5229 if (unlikely(current->mm != vcpu->kvm->mm))
5230 return;
5231
5232 read_lock_irqsave(&gpc->lock, flags);
5233 if (!kvm_gpc_check(gpc, sizeof(*st)))
5234 goto out_unlock_gpc;
5235
5236 st = (struct kvm_steal_time *)gpc->khva;
5237 BUILD_BUG_ON(sizeof(st->preempted) != sizeof(preempted));
5238
5239 st->preempted = preempted;
5240 vcpu->arch.st.preempted = KVM_VCPU_PREEMPTED;
5241
> 5242 kvm_gpc_mark_dirty(gpc);
5243
5244 out_unlock_gpc:
5245 read_unlock_irqrestore(&gpc->lock, flags);
5246 }
5247
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 2+ messages in thread
* [dwmw2:gpc-stealtime 1/1] arch/x86/kvm/x86.c:5242:2: error: call to undeclared function 'kvm_gpc_mark_dirty'; ISO C99 and later do not support implicit function declarations
@ 2026-02-04 8:32 kernel test robot
0 siblings, 0 replies; 2+ messages in thread
From: kernel test robot @ 2026-02-04 8:32 UTC (permalink / raw)
To: Carsten Stollmaier
Cc: llvm, oe-kbuild-all, David Woodhouse, Lilit Janpoladyan,
Sebastian Biemueller
tree: git://git.infradead.org/users/dwmw2/linux gpc-stealtime
head: 34c3f2e56cbf5d6b03946d531e66a91566d90db6
commit: 34c3f2e56cbf5d6b03946d531e66a91566d90db6 [1/1] KVM: x86: Use gfn_to_pfn_cache for record_steal_time
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20260204/202602041639.9pLjTipx-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260204/202602041639.9pLjTipx-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202602041639.9pLjTipx-lkp@intel.com/
All errors (new ones prefixed by >>):
>> arch/x86/kvm/x86.c:5242:2: error: call to undeclared function 'kvm_gpc_mark_dirty'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
5242 | kvm_gpc_mark_dirty(gpc);
| ^
1 error generated.
vim +/kvm_gpc_mark_dirty +5242 arch/x86/kvm/x86.c
5201
5202 static void kvm_steal_time_set_preempted(struct kvm_vcpu *vcpu)
5203 {
5204 struct gfn_to_pfn_cache *gpc = &vcpu->arch.st.cache;
5205 struct kvm_steal_time *st;
5206 static const u8 preempted = KVM_VCPU_PREEMPTED;
5207 unsigned long flags;
5208
5209 /*
5210 * The vCPU can be marked preempted if and only if the VM-Exit was on
5211 * an instruction boundary and will not trigger guest emulation of any
5212 * kind (see vcpu_run). Vendor specific code controls (conservatively)
5213 * when this is true, for example allowing the vCPU to be marked
5214 * preempted if and only if the VM-Exit was due to a host interrupt.
5215 */
5216 if (!vcpu->arch.at_instruction_boundary) {
5217 vcpu->stat.preemption_other++;
5218 return;
5219 }
5220
5221 vcpu->stat.preemption_reported++;
5222 if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
5223 return;
5224
5225 if (vcpu->arch.st.preempted)
5226 return;
5227
5228 /* This happens on process exit */
5229 if (unlikely(current->mm != vcpu->kvm->mm))
5230 return;
5231
5232 read_lock_irqsave(&gpc->lock, flags);
5233 if (!kvm_gpc_check(gpc, sizeof(*st)))
5234 goto out_unlock_gpc;
5235
5236 st = (struct kvm_steal_time *)gpc->khva;
5237 BUILD_BUG_ON(sizeof(st->preempted) != sizeof(preempted));
5238
5239 st->preempted = preempted;
5240 vcpu->arch.st.preempted = KVM_VCPU_PREEMPTED;
5241
> 5242 kvm_gpc_mark_dirty(gpc);
5243
5244 out_unlock_gpc:
5245 read_unlock_irqrestore(&gpc->lock, flags);
5246 }
5247
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
^ permalink raw reply [flat|nested] 2+ messages in thread
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